221102021021210 has 48 divisors (see below), whose sum is σ = 463041771055560. Its totient is φ = 75793109212800.

The previous prime is 221102021021149. The next prime is 221102021021249. The reversal of 221102021021210 is 12120120201122.

It can be written as a sum of positive squares in 4 ways, for example, as 221060129984281 + 41891036929 = 14868091^2 + 204673^2 .

It is a super-2 number, since 2×221102021021210² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36781025 + ... + 42368004.

Almost surely, 2^{221102021021210} is an apocalyptic number.

221102021021210 is an abundant number, since it is smaller than the sum of its proper divisors (241939750034350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221102021021210 is a wasteful number, since it uses less digits than its factorization.

221102021021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79154751 (or 79154744 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221102021021210 its reverse (12120120201122), we get a palindrome (233222141222332).

The spelling of 221102021021210 in words is "two hundred twenty-one trillion, one hundred two billion, twenty-one million, twenty-one thousand, two hundred ten".